Sheave-block



(No Moden.)

J. H. REDMOND.

SHEAVE BLOCK.

N0. 360,050. Patented Mar. Z9, 1887.

(Il A (In )5 [E y MQ/UM im w W@ 2% ,2? fw NITED STATES ATENT Carien.

JOSEPH H. REDMOND, OF SAN FRANCISCO, CALIFORNIA.

SHEAVE-BLOCK.

SPECIFICATION forming part of Letters Patent No. 360,050I dated March 29, 1887.

Application filed November 1B, 1886. Serial No. 219,326. (Nomodcl.)

To all whom, t may concern.-

Be it known that I, JOSEPH H. REDMOND, of San Francisco, State of California, haveinvented a new and Improved Sheave-Bloek for Hoisting and other Purposes, of which the following is a specication.

The invention relates to all the various patterns of sheave-bloeks where the improvement niay be found applicable; and it consists in the method of hanging the sheave in the block, by which the block,as a whole,and the sheave in particular, is rendered more durable and a large amount of friction is avoided in operating.

In the accompanying drawings, forming part of this specification, Figure l is a sectional elevation taken on avertieal line cutting through the axis of the sheave. Fig. 2 is a side view of the block.

In both figures the saineletters of reference are used to indicate the saine parts.

The usual method of hanging the sheaves in these blocks is to arrange a fixed spindle to rest in the side cheeks of the block and allow the sheave to loosely revolve upon it. In this way, owing to the necessarily-narrow bearing, which can be no wider than the space between the cheeks ofthe block,or equal to the distance through the hub of the shea ve, and because of the difficulty of properly lubrieating this bearing, which is often allowed to run dry, the hub of the sheave is subject to rapid wear, so thatwhen heavy work is done the sheave of a new block frequently coniniences to wabble after a few hours7 use, and often in consequence the sheave bears hard against the side cheeks of the block at its periphery, cutting away the wood and causing excessive friction. Then the sheave has to be taken outand rebushcd at considerable expense and loss of time.

The present invention is designed to obviate this difficulty and reduce the friction to a mini- Inuin by a system of thorough lubrication, and by giving increased width of bearing for the spindle-journals distributes the necessary friction over a more extended surface, and thus minimizes its wearing action, to the effect of greatly increasing the life of the block.

In the drawings, A A are the cheeks of the block; B B, the parting-strips; C C C C, the bolts which fasten these together.

D D are the ropesli ngs, within which the block is held.

E is the eye for the hanging hook, which it is unnecessary to show.

F is the sheave over which the running-rope passes. G is its spindle, and H H are the boxes in which the spindle is supported and revolves. These boxes are niade solid and pass through the cheeks of the block, to bear against the hub ofthe sheave on one end, and out and beyond at the opposite end a little distance inside the ends of the spindle, the journals of which may be as long, within reasonable limits, as desired. The boxes have flanges lz., which extend sidewisc to beyond the rope-slings, so that the bolts h may be easily got at. These latter bolts should have their heads countersunlr in the cheeks of the block on the inside, as shown in dotted lines, Fig. l. Y

The holes bored through the boxes to receive the spindle will serve, where the boxes extend beyond the spindle, as receptacles for a suitable inspissated lubricant, K, such as is used for earriageaxles. The outer circumference of the boxes has at the end projecting outward a screw-thread,and a cap, I, also having a screw-thread cut within its interior, will screw over it.

Along the spindle, at each end as far as the hub of the sheavc7 there is a little groove, t', cut to permit the lubricant to reach the hub and lubrieate adjoining surfaces of hub and box.

The caps I will be about half filled with the lubricant before being screwed on; also the space between the end ofthe spindle and end ofthe box will be filled.

rIhe spindle is driven tightly in the hub of the sheave, and it may be, if preferred, either square where it passes through the sheave,or a triie larger in diameter than thejournals, so that there will be a shoulder on the spindle to bear against the box on each side,and thus prevent any lateral motion,should there be a tendency to acquire it.

I ani aware that the spindles of sheavebloeks haveheretoforc been constructed with IOO rotating spindles carried in boxes on each side of the sheave; andi do not broadly claim such a construction.

What I claim ,as my invention, and desire 5 to secure by Letters Patent, is as follows:

A sheave-block for hoisting, comprising the following parts: the wooden cheeks A A and parting-strips B,bolted together, rope-sling D, with eye E, separate elongated boxes H, carry 1o ing spindle G,said boxes havingside anges to bolt them to the cheeks A, the inner ends being made to pass through the cheeks and abut against the hub of the sheave, and the outer endsbeing provided with a lubricant-chamber formed by the caps I screwed thereon, sheave 15 I F, and spindle G, firmly secured in the hub thereof, the'whole arranged and operating substantially as described.

JOSEPH H. REDMOND. Witnesses:

GEO.' PARDY, J AMES L. DRUM. 

